JPS60250738A - Centralized supervisory control device - Google Patents

Abstract

PURPOSE:To connect a power interface to a local station through a transmission line and to detect rapidly abnormality by connecting the power interface having a timer part to an I/O port formed on a main control part in a personal computer. CONSTITUTION:The I/O port is mounted on the main control part 1 in the personal computer for a centralized supervisory control device in a standard way. A current amplifier 11 and a timer part 12 in the power interface are connected to the I/O port 10 through signal lines 13-18. Plural local machines 19 are connected to the current amplifier in the interface through transmission lines 5 and loads 8 to be controlled are connected to the respective local machines 19 through signal lines 20. The transmission of a status signal between the load 8 and the controller 1 is interfered by the current amplifier 11 and the timer 12 in the interface, so that the abnormality is detected rapidly and the constitution of the device is simplified.

Description

[Detailed description of the invention] Industrial applications.

The present invention relates to air conditioners and monitoring control of measurement data transfer.

Conventional configurations and their problems In recent years, centralized monitoring and control systems have been introduced into buildings and the like in order to save energy and labor.

Referring to FIG. 1, conventional centralized monitoring control will be described.

1 is a combination unit that transmits control signals, -ter 2 is a network control section of the central interface that performs communication control, 3 is a modulation/demodulation section of the central interface that converts it into a voltage signal to be transmitted, and 4 is a computer 1 and central interface. 6 is an interface for a plurality of terminals; 7 is a network control section; 6 is a central interface connecting the network control section 2 and the interfaces for a plurality of terminals; 8 is a controlled load, and 9 is a signal line connecting the network control section 7 of the terminal interface and the controlled load 8.

In the above configuration, first, a control signal is sent from the computer 1 via the signal line 4 to the network control unit 2, enters the modulation/demodulation unit 3, is converted from a voltage signal to a frequency signal, and is sent through the transmission line 6 to the terminal interface. The signal is converted back into a voltage signal by the modulation/demodulation section 6 and transmitted to the network control terminal 8 of the terminal specified by the address.

In addition, the status signal from the controlled load 8 is converted into a serial voltage signal by the network control unit 7, further converted into a frequency signal by the modulation/demodulation unit 6, and then
The voltage signal is then converted into a voltage signal again by the modulation/demodulation section 3 of the central interface, and transmitted to the computer 1 via the network control section 2.

However, since the above configuration uses frequency signals for transmission, it requires a modulation and demodulation section that mutually converts voltage signals and frequency signals, and an interface that includes a network control section that controls the modulation and demodulation section and the transmission signal. And so.

Furthermore, with the above configuration, it is difficult to detect an abnormality in the transmission system, and if a signal is not sent back, communication remains stopped and control is interrupted.

OBJECTS OF THE INVENTION The present invention provides a central supervisory control device that simplifies the interface in the supervisory control device and can promptly detect abnormalities in transmission lines.

Structure of the Invention In order to achieve the above object, the present invention connects a power interface having a timer section to an input/output port that is standard equipment in the main controller of a personal computer.
The configuration is such that a transmission line connects the power interface and the slave unit.

In this configuration, the signal from the main controller is current-amplified by the power interface and directly transmitted to the slave unit, simplifying the interface section.Furthermore, the server timer circuit connected to the input/output port transmits the control signal. Abnormalities in the transmission system are detected based on the elapsed time until reception of the response signal.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the central monitoring device of the present invention is shown in FIG. 2 and will be described.

In FIG. 2, 1 is a main controller consisting of a personal computer, and 1o is an R8 that is standard equipment in the main controller 1.
Input/output ports consisting of a 232C port, 11 a current amplification section of the power interface, 12 a timer part of the power interface, 1314.15, 16, 17.
Reference numeral 18 denotes a signal line connecting the input/output capo) 10 and the current amplification section 11 and timer part 12 of the power interface, 19 a plurality of slave units, and 6 a signal line connecting each slave unit 19 and the current amplification unit 11 of the power interface. The connected transmission lines 8 are controlled loads, and 20 are signal lines that connect the slave unit 19 and the controlled loads 8.

The operation will be explained below.

As shown in Figure 3, the HIGH signal is +12V, LO
The W signal is -12V, and T'a is the time required for one transmission/reception. The main controller 1 connects the transmittable signal line 16 to the fiH
The IGH signal is sent to the current amplifier section 1 of the power interface.
1 and the timer part 12, and then a control signal is sent to the transmission data signal line 14.

The timer part 12 is activated by the HIGH signal on the transmission enable signal line 16.
is activated and the data set ready signal line 18 is LOW.
The signal is sent to the main controller 1. The control signal from the main controller 1 is current-amplified by the current amplifying section 11, enters the slave unit 19 through the transmission line 6, is converted into a parallel signal, and is transmitted to the controlled load 8 through the signal a2d.

The status signal of the controlled load 8 is converted into a serial signal by the slave device 19, and then transmitted through the transmission line 6. Current control section 11. The received data is returned to the main controller 1 through the signal line 16.

When the main controller 1 receives the status signal, it sends a HIGH pulse signal through the data terminal ready signal line 17, resets the timer part 12, completes one transmission/reception, and moves on to the next transmission/reception.

If the status signal is not returned from the controlled load 8 due to an abnormality in the transmission line, as shown in FIG. High from data set ready signal line 18
An H signal is sent to the main controller 1 to notify it of an abnormality in the transmission line.

When the main controller 1 receives this signal, it can terminate one transmission/reception and immediately proceed to the next transmission/reception without having to continue waiting for a status signal.

Effects of the Invention As is clear from the above explanation, the present invention eliminates the need for network control and modulation/demodulation interfaces by transmitting voltage signals, and only requires a current amplification interface, which simplifies the interface. It becomes possible to lower the price and improve reliability.

Furthermore, by providing a part of the timer in the interface, abnormality detection can be performed easily and the transmission speed can be increased.

[Brief explanation of drawings]

FIG. 1 is a basic configuration diagram of a conventional supervisory control device, FIG. 2 is a circuit diagram of a centralized supervisory control device according to an embodiment of the present invention, and FIG. 3 is an input diagram when signals are normally exchanged. FIG. 4 is a signal diagram showing the input and output signals when there is an abnormality in the transmission system. 1... Main controller, 6... Transmission line, 8...
...Controlled load, 12... Part of the timer. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 211 Figure 3 Figure 4 (/8λ

Claims (1)

[Claims] A solid device consisting of a main controller and a power interface that detects abnormalities in the transmission system from current amplification and elapsed time;
A centralized monitoring and control device consisting of a slave unit, a controlled load connected to the slave unit, and a transmission line connecting the solid device and the slave unit.